linux-kernel - Re: [PATCH] gpio: langwell: ensure alternate function is cleared

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Date:	Thu, 06 Oct 2011 09:37:21 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH] gpio: langwell: ensure alternate function is cleared

On 05/10/11 19:58, Grant Likely wrote:
> On Wed, Oct 5, 2011 at 1:52 AM, Adrian Hunter<adrian.hunter@...el.com>  wrote:
>> On 04/10/11 21:37, Grant Likely wrote:
>>>
>>> On Mon, Oct 03, 2011 at 02:36:07PM +0300, Adrian Hunter wrote:
>>>> +       ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg
>>>> * 4);
>>>
>>> This looks wrong.  It looks to me like the __iomem annotation should
>>> be added to ->reg_base.
>>>
>>> Otherwise, the patch looks okay.
>>>
>>
>> Deserves a separate patch...
>
> What order do they get applied in?</grant-being-lazy>

First one first ;-)

i.e.

gpio: langwell: ensure alternate function is cleared
gpio: langwell: declare reg_base as __iomem

Since the absence of __iomem was present before the original
patch, there is no advantage to having the second one first,
but the original patch would need to be changed as well.

>
>>
>> From: Adrian Hunter<adrian.hunter@...el.com>
>> Date: Wed, 5 Oct 2011 10:29:27 +0300
>> Subject: [PATCH] gpio: langwell: declare reg_base as __iomem
>>
>> reg_base is __iomem so add that to the declaration
>> and fix up assignment casts and types.
>>
>> Signed-off-by: Adrian Hunter<adrian.hunter@...el.com>
>> ---
>>   drivers/gpio/gpio-langwell.c |   12 ++++++------
>>   1 files changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
>> index 00692e8..b7465e5 100644
>> --- a/drivers/gpio/gpio-langwell.c
>> +++ b/drivers/gpio/gpio-langwell.c
>> @@ -64,7 +64,7 @@ enum GPIO_REG {
>>
>>   struct lnw_gpio {
>>         struct gpio_chip                chip;
>> -       void                            *reg_base;
>> +       void __iomem                    *reg_base;
>>         spinlock_t                      lock;
>>         unsigned                        irq_base;
>>         struct pci_dev                  *pdev;
>> @@ -78,7 +78,7 @@ static void __iomem *gpio_reg(struct gpio_chip *chip,
>> unsigned offset,
>>         u8 reg = offset / 32;
>>         void __iomem *ptr;
>>
>> -       ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg *
>> 4);
>> +       ptr = lnw->reg_base + reg_type * nreg * 4 + reg * 4;
>>         return ptr;
>>   }
>>
>> @@ -90,7 +90,7 @@ static void __iomem *gpio_reg_2bit(struct gpio_chip *chip,
>> unsigned offset,
>>         u8 reg = offset / 16;
>>         void __iomem *ptr;
>>
>> -       ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg *
>> 4);
>> +       ptr = lnw->reg_base + reg_type * nreg * 4 + reg * 4;
>>         return ptr;
>>   }
>>
>> @@ -299,7 +299,7 @@ static const struct dev_pm_ops lnw_gpio_pm_ops = {
>>   static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
>>                         const struct pci_device_id *id)
>>   {
>> -       void *base;
>> +       void __iomem *base;
>>         int i;
>>         resource_size_t start, len;
>>         struct lnw_gpio *lnw;
>> @@ -324,8 +324,8 @@ static int __devinit lnw_gpio_probe(struct pci_dev
>> *pdev,
>>                 dev_err(&pdev->dev, "error mapping bar1\n");
>>                 goto err3;
>>         }
>> -       irq_base = *(u32 *)base;
>> -       gpio_base = *((u32 *)base + 1);
>> +       irq_base = *(__force u32 *)base;
>> +       gpio_base = *((__force u32 *)base + 1);
>>         /* release the IO mapping, since we already get the info from bar1 */
>>         iounmap(base);
>>         /* get the register base from bar0 */
>> --
>> 1.7.6
>>
>>
>
>
>

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